The Gulf conflict has underscored the growing importance of mass-produced, low-cost weapons systems, particularly drones and munitions, and exposed the limitations of relying on expensive defensive technologies to counter them, according an executive at the defense tech firm Mach Industries. WASHINGTON -- Just over three months of conflict in the Gulf has underscored the growing importance of mass-produced, low-cost weapons systems, particularly drones and munitions, and exposed the limitations of relying on expensive defensive technolog... [3325 chars]